[AT] hydraulics problem

[Cecil Bearden]

Lew
you mentioned that the roll pins had been replaced.    Check to see that the 
control valve can move in and out.  My old Massey had a slot that the roll 
pin in the control valve shaft slid in and out to regulate the fluid.  I 
reamed it out to pin it solid. and had no more Power steering...

Cecil in OK
----- Original Message ----- 
From: "Lew Best" <bee_keeper at earthlink.net>
To: <at at lists.antique-tractor.com>
Sent: Thursday, February 09, 2006 6:25 PM
Subject: [AT] hydraulics problem


>
> Hey guys
>
> Got a problem; (so what else is new)?
>
> On an old John Deere 420 power steering it's doing something crazy!
> Solved a few problems yesterday; got it to turning pretty good one way
> but not near as good the other.  Had a bad leak on one of the rotten old
> hoses coming from the control valve to the cylinder so replaced the hose
> today thinking that would fix it.  Well, that made things worse!  Seems
> that when it had pressure on the good hose that the leak let the return
> fluid from the cylinder out so it worked.  Now (with no leak for the
> return flow) no turn either way.  Someone had obviously had problems
> with this steering before (had sheared keys & roll pins, etc.) so now
> I'm kinda grasping at straws.  What is obviously supposed to happen is
> when you turn there should be pressure to one end of the cylinder making
> it push & the fluid from the other end be allowed to go back to the
> suction side of the pump.  Is there a check valve inside of the control
> that could be stuck? I've removed the hoses one at a time (right, left &
> return) & all seem to squirt fluid "when they should."
>
> BTW I wanted to replace one of the shafts in the valve (pretty well
> mutilated) but the shaft is no longer available thru JD.  Asked about a
> complete valve & same response.  Hate to tear into it not knowing if any
> parts available (seals, etc.) but guess I'll have too.  No good the way
> it is!  Anyone got one (or know of a source) without having to give an
> arm & a leg for it?
>
> Any ideas appreciated!!!!!!!
>
> Lew
>
>
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